Over-expression of HSP70 attenuates caspase-dependent and caspase-independent pathways and inhibits neuronal apoptosis.

Over-expression of HSP70 attenuates caspase-dependent and caspase-independent pathways and inhibits neuronal apoptosis.
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HSP70的过表达可减弱caspase依赖性和caspase独立的途径,并抑制神经元凋亡。

DOI:
10.1111/j.1471-4159.2012.07927.x
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发表时间:
2012-11
影响因子:
4.7
通讯作者:
Faden AI
Faden AI
中科院分区:
医学2区
文献类型:
--
作者:
Sabirzhanov B;Stoica BA;Hanscom M;Piao CS;Faden AI

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HSP70 是热休克蛋白家族的一员,已知热休克蛋白在损伤和/或应激后在神经元中上调。 HSP70 过度表达与多种模型中的神经保护有关,包括神经退行性疾病。相比之下,人们对 HSP70 在神经元凋亡中的神经保护作用以及神经元程序性细胞死亡 (PCD) 机制的调节知之甚少。我们使用四种独立的细胞凋亡模型:依托泊苷、星形孢菌素、C2-神经酰胺和 β-淀粉样蛋白,检查了通过转染 HSP70 表达质粒在原代皮质神经元和 SH-SY5Y 神经元细胞系中 HSP70 过表达的影响。在这些细胞凋亡模型中,转染 HSP70 构建体的神经元显示出核细胞凋亡标记和/或细胞死亡的诱导显着减少。此外,我们证明 HSP70 结合并可能灭活凋亡蛋白酶激活因子 1 以及凋亡诱导因子,它们分别参与 caspase 依赖性和 caspase 非依赖性 PCD 发育的关键分子。 caspase 依赖性 PCD 标记物,包括活性 caspase-3、caspase-9 和裂解的 PARP,在过表达 HSP70 的神经元中减弱。这些数据表明 HSP70 可以防止神经元凋亡,并表明这些作用至少部分反映了对 caspase 依赖性和 caspase 非依赖性 PCD 途径的抑制。
HSP70 is a member of the family of heat-shock proteins that are known to be up-regulated in neurons following injury and/ or stress. HSP70 over-expression has been linked to neuroprotection in multiple models, including neurodegenerative disorders. In contrast, less is known about the neuroprotective effects of HSP70 in neuronal apoptosis and with regard to modulation of programmed cell death (PCD) mechanisms in neurons. We examined the effects of HSP70 over-expression by transfection with HSP70-expression plasmids in primary cortical neurons and the SH-SY5Y neuronal cell line using four independent models of apoptosis: etoposide, staurosporine, C2-ceramide, and β-Amyloid. In these apoptotic models, neurons transfected with the HSP70 construct showed significantly reduced induction of nuclear apoptotic markers and/or cell death. Furthermore, we demonstrated that HSP70 binds and potentially inactivates Apoptotic protease-activating factor 1, as well as apoptosis-inducing factor, key molecules involved in development of caspase-dependent and caspase-independent PCD, respectively. Markers of caspase-dependent PCD, including active caspase-3, caspase-9, and cleaved PARP were attenuated in neurons over-expressing HSP70. These data indicate that HSP70 protects against neuronal apoptosis and suggest that these effects reflect, at least in part, to inhibition of both caspase-dependent and caspase-independent PCD pathways.
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发表时间: 2002-10-01
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